Improvement in furnaces



J'. K. CALDWELL.

FURNACE. i No. 169,338 Patented Nov. 2, 1875.-

- J] VA V/ /////////////////////////////////J g Inva nar' UNITED S ATES P TENT OFFICE JOSEPH K. CALDWELL, OF PHILADELPHIA, PENNSY'LVANIA, ASSIGNOR TO HIMSELF AND JOHN L. KATES, OF SAME PLAOE.

IMPROVEMENT IN FURNACES.

Speoification forming part of Letters -Patent No. 169338, date& November 2, 18753 application filed September 4, 1874.

To all whom it may concm:

Be it known that I, J OSEPH K. CALDWELL, of Philadelphia, Pennsylvania, haveinvented an Improvement in Furnaces, of which the following is a specification:

The object of my invention is to burn in furnaces, with effective and economical results, petroleum, or other hydrocarbons, with coaldust, and this object I attain by combining with a furnace the system of pipes and nozzles represented in the acconpanying drawing.

Figure l is a vertical section of a puddling or heating furnace, through the roof E of which, as well as through the chinney G, pass the two pipes B and D, the former for admitting air under p'ressure, and the latter for receiving a jet of steam from a nozzle, a, the said jet inducing petroleum or other hydrocarbon to pass from any adjoining reservoir through *the branch b into the said pipe D. Both of the pipes B 'and D communicate with a V short pipe or nozzle, d, which projects into the nozzle d, where it unites with the supply of compressed and heated airforced through the pipes B, the two elements forming a highlyinflammablegas, which burns with an intense heat in the interi'or F of the furnace. The coal-dust passes from the hopper H into the pipe B, along which it is forced by the blast, and at the same time so heated by the latter that on escaping from the nozzle d into the furnace itis in a condition to be instantly consuned by the fiame, thereby adding to the intense heat of the same.

The sectional View, Fig. '2, of the drawing represents a modification of my invention. In

this case the pipe d passes through a flue, m, formed in the roof of .the 'urnace, this flue communicating with a return-fine, n, through which the pipe B passes. By placing a sliding damper, p, in the chimney Gr, between the two flues, more 'or less of the products of combustion from the furnace may be induced to pass in the direction of the arrow through the flue m, and thence through the flue n to the chimney, thereby imparting to. the pipes a more intense heat than they can acquire by being simply embedded in the roof of the furnace.

I claim- The pipes B and D communicating with the nozzle d, the hopper H communicating into the pipe B, the oil-pipeb communicating with the 'pipe D, and'nozzle a arranged opposite the open end of the pipe D, all combined with each other and with afurnaee substantially as and for the purpose set forth.

In testimony whereof I have signed my name to thi specification in the presence of two subscribing witnesses.

JOSEPH K. GALDWELL.

Witnesses HARRY SMITH, HUBERT HowsoN. 

